Shambleshark

Evolve has a real timing problem, just not the one a sequencing chart suggests. The trigger fires only on the turn a bigger creature actually enters, which means a 2/1 with evolve cast on turn two often spends the early game vulnerable: it sits exposed at sorcery speed, the cheapest thing on the board, with no counter on it yet and a full turn for the opponent to point removal or a bigger blocker at it. Flash is the answer to that exposure. Hold it up instead, drop it at end of turn into an open mana window, and the body lands without ever offering a sorcery-speed target; on the swing back it can ambush an attacker that committed against an empty board. Then it spends the rest of the game as a counter magnet, taking a +1/+1 every time something larger arrives. The two keywords pull the same direction, which is rarer than it sounds for a cheap two-keyword creature: many evolve bodies just stood in the open waiting for the curve to catch up, while this one picks its own window to arrive. The Shark Crab line is part of an era's habit of welding two real animals together for flavor in the blue-green vein, but the design underneath is disciplined: an instant-speed counter accumulator that converts a fragile body and an awkward trigger into a growth engine you get to deploy on your terms.